The NSW RFS said they were “seeing lots of lightning - in places we really don’t need it” including the Hawkesbury region and Blue Mountains, and asked residents to report any other fires as they see them.

Thunderstorms are creating difficult conditions for firefighters at the Gospers Mountain bush fire burning in the Hawkesbury area. Lightning strikes have been detected. These conditions can be dangerous because the fire can create its own weather. #nswrfs#nswfirespic.twitter.com/BYrnGgcFRx

We're seeing lots of lightning - in places we really don't need it. Storms have been recorded around the Gospers Mtn fire in the Hawkesbury, as well as through the Blue Mountains. Report any new fires to Triple Zero (000). #nswrfs#nswfirespic.twitter.com/StFasodRNy

On Friday morning Sydney was still battling haze and smoke from bushfires as scores of blazes sprang up in new locations across Australia, triggering warnings that it was too late for some residents to evacuate.

In Sydney residents were urged to keep children indoors as thick smoke blanketed the city for the fourth consecutive day, increasing pressure on Prime Minister Scott Morrison to address climate change issues.

The smoke is set to clear in some areas but may drift back this coming weekend, according to authorities.

Matt Blyth via Getty ImagesSmoke shrouds the Sydney Opera House.

The smoke around Sydney, the Illawarra and north coast is going to hang around for a bit longer. It's likely to settle across much of the coast tonight before a change moves through overnight and tomorrow morning. The smoke is however likely to return over the weekend. #nswrfspic.twitter.com/RvbyM50UqW

The early arrival and severity of the fires in the southern hemisphere spring follows three years of drought, which has left bushland tinder-dry and been linked by experts to climate change.

Firefighters have followed the crisis across four states as extreme temperatures and high winds sparked wildfires in new areas, even as they struggle contain existing fires.

On Thursday, it was Victoria’s turn, with dozens of fires burning across the state by early afternoon. Authorities warned locals in towns about 50 km north of Ballarat that it was too late for them to evacuate safely.

“You are in danger, act now to protect yourself,” Victoria Country Fire Authority said in an alert. “It is too late to leave. The safest option is to take shelter indoors immediately.”

Authorities had earlier issued a Code Red alert, which indicates the worst possible bushfire conditions, warning people that should a fire start it will be fast moving, unpredictable and likely uncontrollable. It was the first Code Red alert issued by Victoria in 10 years.

In New South Wales, strong winds blew smoke from 60 fires still burning over much of Sydney, leaving the city and its famous landmarks shrouded in thick smog.

Officials told parents to keep children inside as pollution recordings showed the smoke at five times the level considered hazardous.

“They’re (children) often more active particularly outdoors so they’re more likely to inhale the smoke in large quantities,” Richard Broom, director of environmental health at NSW Health said in an emailed statement.

State officials also imposed tough new water restrictions on Sydneysiders, to kick in from December 10 when a key dam is expected to be down to 45% capacity. Residents will face fines if they use hoses to water their gardens and wash their cars.

At 5pm there are 59 bush & grass fires burning across the state, with 29 still to be contained. One fire remains at Emergency Warning and two are at Watch & Act. There are no total fire bans tomorrow but widespread very high fire danger & warm weather is set to continue. #nswrfspic.twitter.com/o6lhsLwsiH

CLIMATE POLITICS

The unrelenting conditions have sharpened attention on the climate change policies of Prime Minister Scott Morrison, who rejected rejecting any link on Thursday.

“Climate change is a global phenomenon, and we’re doing our bit as part of the response to climate change,” Morrison told ABC radio. “To suggest that with just 1.3% of global emissions that Australia doing something differently – more or less – would have changed the fire outcome this season, I don’t think that stands up to any credible scientific evidence at all.”

Morrison’s conservative government has committed to the Paris Agreement to reduce its emissions by 26-28% from 2005 levels by 2030. Critics point out that current projections suggest it will not meet that target and have called on the government to put in place policies to address the shortfall.